every 50 miles, soak your shirt with water. Either by taking it off, thoroughly wetting it, wring it, put it back on. or using a bottle of water while pressing your shirt against you, pour water along your collar line.
why 50 miles? that's about the evaporation time. go tank to tank and what was once water is now sweat...
the georgia welcome station on 301 at the SC border gives free soda fountain colas...don't wet your shirt with those!
